采用F-P光纤环滤波器的窄线宽环形腔光纤激光器  

Narrow linewidth ring cavity fiber laser using F-P fiber ring filter

作　　者：方秀丽[1] 童峥嵘[1] 曹晔[1] 杨秀峰[1] 

机构地区：[1]天津理工大学计算机与通信工程学院薄膜电子与通信器件重点实验室,天津300384

出　　处：《红外与激光工程》2013年第2期329-333,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(61107052);天津市自然科学基金(11JCYBJC00100)

摘　　要：提出了一种采用F-P光纤环滤波器的窄线宽环形腔激光器,该激光器采用环形腔结构,两个耦合比为30:70的耦合器和一段2 m长的未泵浦掺铒光纤构成F-P光纤环滤波器,F-P光纤环滤波器产生的梳状谱,可以增大激光模式之间的自由光谱范围(FSR),在一定程度上减小跳模现象的发生,有利于模式的稳定。研究表明,通过对掺铒光纤的优化和耦合器的选择可以提高F-P光纤环滤波器的精细度,而F-P光纤环中的未泵浦掺铒光纤起到饱和吸收体的作用,使输出激光的线宽得到有效压缩。将保偏光纤光栅和F-P光纤环滤波器共同应用于环形腔掺铒光纤激光器,在室温下得到了3 dB线宽均小于0.07 nm(实验室光谱仪最小分辨率)的窄线宽双波长输出。在2 h的观测时间内,最大峰值功率波动小于0.4 dB,具有良好的稳定性。A kind of narrow line-width fiber laser using F-P fiber ring filter was proposed and experimentally demonstrated,which has a ring cavity.A F-P fiber ring filter consisted of two optical couplers of 30：70 and a length of 2 m unpumped Erbium-doped fiber.The comb spectrum produced by F-P fiber ring filter can magnify the free spectral range of the laser mode,eliminate mode hopping and increase the stability of the mode in a certain extent.The research shows that the fineness of F-P fiber filter can be improved through the optimization of Erbium-doped fiber and the selection of couplers. Unpumped Erbium-doped in the F-P fiber ring acts as saturated absorber,which can compress the linewidth of output laser effectively.Polarization-maintaining fiber grating（PM-FBG） and F-P fiber ring filter are both applied into Erbium-doped laser,the output of narrow linewidth and dual-wavelength laser is obtained,and the 3 dB linewidth of dual-wavelength laser are both less than 0.07 nm（spectrometer minimum resolution）.The fiber laser had a stable output whose maximal peak power fluctuation was less than 0.4 dB within observation time of 2 h.

关 键 词：光纤激光器 F-P光纤环滤波器 饱和吸收体 窄线宽 环形腔 

分 类 号：TN248.1[电子电信—物理电子学]